Temperature effect on cathodic protection (CP) design current density was examined by electrochemical tests, and a case study of optimized CP design for the FPSO (Floating Production Storage and Offloading) using a computational analysis tool was performed. Electrochemical test results showed the specimen (EH36) in 28 °C had the lower current density and higher resistance than that of 5 °C. It was because of calcareous deposit which was verified by surface analysis using SEM and EDS. Computational analysis results showed that the structure in 5 °C didn’t satisfy the CP criteria at the bottom shell and mooring chain. The structure at 28 °C satisfied the protective potential range, however, unstable enough to predict corrosion damage. To optimize and resolve the problems, the CP design was changed. Consequently, the structure at 5 °C is sufficient to satisfy the protective potential criteria at bottom shell and mooring chain. In the case of 28 °C, a more even potential distribution is achieved.

Subject
Steel structures, Electrochemical impedance spectroscopy, Galvanic anodes, Offshore structures, Cathodic protection, Potentiostatic polarization, Seawater, Surface analysis, Current densities, Floating production storage and offloading units, Electrochemical potential, Calcareous deposits, Anodes
Keywords:
cathodic protection, corrosion, computational analysis
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2017
Association for Materials Protection and Performance (AMPP)
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